Mechanism for operating shears



(No Mode.) 2 Sheets-Sheet 1.

J. KENNEDY. MEGHANISM EUR OPERATING SHEARS, PRESSES, dw No. 581,165.PatentedvApr. 20, 1897;

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(No Model 2 Shets-Sheet 2.'

KENNEDY MECHANISM EGROPERATING SHBARS, PRESSES, Gac. No. 581,165.PatentedApr. 20, 1897.

WITNESSES I INVENTOR gkuw. ML

@ MBQMMQ 'UNITED STATES PATENT union.

JULIAN KENNEDY, OF PITTSBURG, PENNSYLVANIA.

MECHANISIVI FOR OPERATING SHEARS, PRESSES, 80C.

SPECIFICATION forming part of Letters Patent No. 581,165, dated April20, 189'?.

Application filed February 2, 1897. Serial No. 621,705. (No model.)

To all whom, t may concern,.-

Beit known that I, JULIAN KENNEDY, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Mechanism for Operating Shears, Presses, dac., of whichthe following is a full, clear, and exact description, reference beinghad to the accompanying drawings, forming part of this specification, inwhich- Figure l is a front elevation, partly in section, of shearsconstructed in accordance with my invention; and Fig. 2 is a verticallongitudinal section of the same.

My invention relates to mechanism for operating the movable member ofshears, presses, and like apparatus, and is designed to greatly cheapenand simplify their construction, reduce the amount of space occupiedthereby, and at the same time procure a stronger device.

To that end it consists in a plunger arranged to operate the movablemember of the apparatus, the rod or rods connecting the plunger to themovable part passing through the head of the plunger-cylinder insteadof, as heretofore, being connected to a crosshead secured at the upperend of the plunger and extending from the cross-head eXteriorly to thecylinder.

In the drawings, in which similar numerals indicate corresponding parts,I show my invention as applied to a shear mechanism, 2 representing thegeneral frame and 3 the single-acting plunger or ram-cylinder, which ispreferably cast integral with the cored-out support, having outer legs 44 and an inner web 5.

6 is the plunger, movable withinthe cylinder 3, and 7 7 4are rodssecured within this plunger and extending directly through thecylinder-head to the movable shear-blade 8. Suitable stuffing-boxes 9 9are provided within the cylinder-head for the rods 7, which rods arereduced in diameter to form shoulders 10, fitting in correspondingrecesses in the plunger. The cylinder 3 is provided at its upper endwith a packing-gland ll, and the central portion of the plunger is madehollow, forming a cylinder 12, which moves over the stationary hollowplunger 13, through which iluid is introduced into the cavity of theplunger 6. This second plunger 13 is provided for the purpose of forcingthe plunger 6 back to its normal position with the shear-blades open,gravity assisting in this return stroke.

14. is the stationary shear-blade secured to the frame, and l5 and 16the usual feed-rollers and guides for the metal operated upon.

The advantages of my invention will be apparent to those skilled in theart, since the cumbersome, long, and heavy crosshead which hasheretofore been employed upon the upper end of the plunger and to whichthe rods connecting it to the movable shearblade or other element weresecured is done away with, and the rods pass directly through the headof the'plunger-cylinder. Not only is this upper heavy cross-head doneaway with, but the lower cross-head or movable shear-blade support is0freatly shortened up and made more compact and stronger by reason ofthe rods connecting it to the plunger being brought closely together.

It is evident that the parts may be so arranged that the plungeroperates the upper shear-blade instead of the lower and also that themechanism may be employed upon presses and other apparatus with the.same advantages as upon the shears shown.

Many other changes will suggest themselves to those skilled in the artwithout departure from my invention, since Vhat I claim is l. A shearhaving a movable shear-blade, a cylinder having a plunger movabletherein, and rods secured to the plunger and passing through thecylinder-head, said rods being secured to the movable shear-blade, theplunger being arranged to move said shear-blade toward theothershear-blade and perform the shearing operation.

2. Ina shear, a plunger-cylinder supported upon suitable standards, aiiXed shear-blade secured tothe cylinder-head casting, a plunger withinthe cylinder having rods passing through the cylinder-head, these rodsbeing secured at their outer ends to the movable shear-blade and actingas the guides for said blade in its movements.

3. Mechanism for operating shears, presses, duc., comprising asingle-acting plunger-cylinder, a hollow plunger movable therein, a

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ro inder and having rods extending through the cylinder-head, said rodsheilig Connected to the movable shear-blade :tnd arranged to uetuate thesume in shearing the metal and for-ming the only guides for theshear-blade.

In testimony whereof I have hereunto set I5 my hund.

JULIAN KENNEDY. Witnesses:

THOMAS XV. EAKEWELL, G. I. IIOLDSIHP.

